FindMajorElementInArrOn.cs

 public int majorityElement(int[] a, int size)
    {
        //code here
        
        var majorElement = -1;
        
        var majorElementCount = new Dictionary<int,int>();
        
        for (int i = 0;i<size;i++){
            if(majorElementCount.ContainsKey(a[i])){
                majorElementCount[a[i]]++;
            }
            else{
                majorElementCount.Add(a[i],1);
            }
        }
        
        var maxCount = majorElementCount.Values.Max();
        
        if (maxCount > size/2){
           majorElement = majorElementCount.Where (x=>x.Value == maxCount)
                                        .Select (x=>x.Key).OrderBy(x=>x).Take(1).FirstOrDefault();
        }
        
        return majorElement;
    
    }